Java: Filling a BufferedImage with transparent pixels

Question

I have an off-screen BufferedImage, constructed with the type BufferedImage.TYPE_INT_ARGB. It can contain anything, and I\'m looking for a way to (fairly effic

Answer 1

After you clear the background with the CLEAR composite, you need to set it back to SRC_OVER to draw normally again. ex:

//clear
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.CLEAR));
g2.fillRect(0,0,256,256);

//reset composite
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
//draw
g2.setPaint(Color.RED);
g2.fillOval(50,50,100,100);